What must be done if a football helmet shifts when pressure is applied?

When a football helmet shifts upon the application of pressure, it indicates that the helmet may not have a proper fit. A well-fitting helmet should remain stable and securely in place, providing maximum protection during play. If the helmet shifts, it can compromise the safety of the player by failing to adequately protect the head and reducing the effectiveness of the helmet's shock-absorbing features.

A helmet that does not fit properly poses a risk of injury, as it may not absorb impacts effectively or could come off during play. Thus, if a helmet shifts, it is crucial to reassess and ensure that it is adjusted correctly or replaced with one that offers a better fit. Proper fitting is critical in preventing head injuries and ensuring player safety on the field.